CN104981270A - Device and method for treating biological tissue with low-pressure plasma - Google Patents
Device and method for treating biological tissue with low-pressure plasma Download PDFInfo
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- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/042—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating using additional gas becoming plasma
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- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
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- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00577—Ablation
- A61B2018/00583—Coblation, i.e. ablation using a cold plasma
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- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
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- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
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- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
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- A61L2/0011—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor for pharmaceuticals, biologicals or living parts using physical methods
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- H—ELECTRICITY
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- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
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Abstract
The invention relates to a device for treating biological tissue (G) with a low-pressure plasma, said device comprising a) a transformer (1) for generating a high-frequency electromagnetic field, b) a probe (2) which can be electrically coupled to the transformer (1) and c) a control unit (3) for controlling the high-frequency electromagnetic field generated by the transformer (1). According to the invention, a safety unit (30) is associated with the control unit (3), said safety unit being used to adjust automatically for the corresponding application the power of the electromagnetic field generated by the transformer (1).
Description
Technical field
The present invention relates to the equipment of the employing low pressure plasma process biological tissue of preorder according to claim 1.In addition, the invention further relates to the method adopting low pressure plasma process biological tissue.
Background technology
Known plasma has anti-microbial property.The antibacterial action of plasma caused by heat, dehydration, shear stress, UV radiation, free radical and electric charge.In the example of low pressure plasma (also referred to as cold plasma), because these plasmas at room temperature operate, therefore heat only plays a secondary role.In such low pressure plasma, especially produce active particle (reactive particle), these active particles have sufficiently long service life to carry out disorganize compound by indirectly exposing (exposure); Wherein, these active particles are such as different from oxygen or nitrogen material.These granules especially (inter alia) comprise oxygen atom, superoxide radical, ozone, hydroxyl radical free radical, nitric oxide and nitrogen dioxide.These granules show destructive effects in the most changeable cellular component.
If the cell wall of antibacterial, pathogenic bacteria, virus, fungus or other similar microorganisms is directly exposed in plasma, by using the electronics bombardment existed in plasma to make these cell wall with negative charge.Due to the effect of Coulomb repulsion, by the tensile strength causing mechanical stress to exceed cell wall, and destroy cell wall.But, these cell wall are not only damaged by the mechanical stress caused by electric charge, can also be damaged to make cell wall by the destruction of the cell wall charge balance caused by other different electrostatic interactions, and be damaged to make cell wall by the electrolysis that the permeability such as changing cell wall causes.The deactivation mechanism of microorganism is also produced by the ion of unusual high energy; Wherein, in capacitive coupled system, the energy of these ions is more than 100eV.Undertaken by using these materials bombarding the structural intergrity that can change or destroy cell.But the equipment for generation of such ion beam is very complicated, and be only applicable to process the biological tissue lived, especially tissue or animal tissue, and the cost of equipment is very high.
Therefore, low pressure plasma is particularly well-suited in the process of tissue or animal tissue, especially the process of skin histology, open wound, gingiva, oral cavity etc., to realize the sterilizing of these tissues, especially kill and be arranged in these tissues or structural antibacterial, pathogenic bacteria, virus, fungus or other similar microorganisms etc.
DE 10 2,005 000 950 B3 is known a kind of for by the equipment of ozonization biological tissue and method.This equipment is made up of transformator substantially; Wherein, this transformator changes its voltage and/or current intensity by control appliance; This control appliance is for generation of having the specific DC voltage or current impulse that become characteristic (most variedcharacteristic) most; These DC voltages or current impulse have or do not have DC voltage component.In this case, DC voltage component, by the extra electrode in pending biological tissue, is formed by means of external voltage power supply or circuit.The primary coil of transformator is the coil of damping oscillation circuit, and high-frequency ac current flows through this damping oscillation circuit.Secondary coil forms resonant circuit together with electric capacity to be charged, and the frequency of this resonant circuit is corresponding with the frequency of transformator.The transformator of resonance is typically used as power supply.Therefore, dissimilar tissue may be processed, such as, adopt ozone to the process of gums in oral cavity or the process to affected skin tissue.The power setting of pulse generator (pulse generator) is realized by the executive component arranged on the control device.Power bracket can be arranged in certain numerical range (numerical scale) by using knob by user or the doctor in charge.
But, adopt this known devices, can operation mistake be produced.And this operation mistake may arrange incorrect power bracket.Such as, the treatment of dentistry but be have selected to the power bracket of department of dermatologry application.This is incorrect is arranged causing the therapeutic process of patient very painful, even may cause health problem.
Summary of the invention
Therefore, the object of the invention is to the equipment of the employing low pressure plasma process biological tissue improving preamble feature according to claim 1, thus this incorrect setting can be excluded.Another object of the present invention is to provide a kind of method adopting low pressure plasma process biological tissue, the process to tissue can be realized by the method, and between primary coil and secondary coil, there is no arcing (flashover).
In equipment, this object realizes by having characteristic equipment according to claim 1.And in method, this object then realizes by having characteristic method according to claim 12.The preferred embodiments of the present invention are shown in the claim being subordinated to independent claims 1 and 11.
Equipment according to employing low pressure plasma process biological tissue of the present invention comprises substantially:
-transformator, for the production of electromagnetic field of high frequency;
-probe, with described transformator electric coupling; And
-control device, for controlling the electromagnetic field of high frequency produced by described transformator; Wherein
Described equipment comprises the safety device be connected with control device, by described safety device, and the power of the electromagnetic field that can produce for transformator described in corresponding application Lookup protocol.By this special structure of equipment according to the present invention, ensure that safety device be required process arrange must and the process of realistic (sensible), thus avoid the operation mistake that the power consumption causing transformator increases.
Preferably, described transformator comprises transformer room, and described transformer room has the male part relative with the described male part of described probe; Wherein said male part connects for the electrical/electronic of described control device.Described transformer room is preferably configured to handle, and is formed with meeting ergonomic accordingly.Because transformator self and control unit can be arranged in transformer room, therefore the method is relevant with the compact conformation of whole equipment according to the present invention.Only have the probe for the treatment of biological tissue, and the external power source in appropriate situations for powering for equipment according to the present invention is not arranged on the inside of transformer room.Described transformer room is configured to handle with meeting human engineering, makes user can be happy and reliably operate according to equipment of the present invention too.Wherein, the basic configuration of this transformer room is cylindrical.
Therefore, in order to realize the compact conformation of above-mentioned proposition and carry out the simple and reliable and operation of happiness to equipment according to the present invention, according to of the present invention one preferred thought, described control device is arranged in described transformer room.
But in order to specific application, it is also understandable for described control device being arranged on outside, described transformer room.Especially, when needing to perform very careful process, in the processing procedure of equipment according to the present invention, the extra weight be designed in the transformer room of handle shape will have blanketing.
Described control device can be connected with power supply, to make can provide for operating necessary power supply according to equipment of the present invention.In this example, especially control device is arranged in the example be designed in the described transformer room of handle, but the power supply be contained in equally in described transformer room also can be arranged on outside, transformer room; Wherein the form of this power supply is battery or accumulator.Especially, because whole equipment according to the present invention can operate independent of fixed power source, and especially operate independent of public electric wire net or not common electrical network, therefore the above-mentioned outside, transformer room that is arranged at by power supply is also understandable.But, fixed power source or public electric wire net or not common electrical network can certainly be provided as power supply, and control unit is connected with this power supply.
According to particularly preferred concept of the present invention, the wire jumper (jumper) of male part inside is arranged to by this safety device.Described male part is connected with probe or control device or is positioned at electric mortiser head dummy connected system inside.This plug connected system is between described probe and described transformator.In the present example, the wire jumper being positioned at electric mortiser head dummy connected system inside is used as switch, and by this switch, described control device can determine the power consumption of (fix) described control device or described transformator.Based on position (position) or site (location) of wire jumper, can specify to use according to such as, by tissue to be processed (the external treatment surface on such as gums or corium, open wound).Preferably, operation of the apparatus according to the invention part does not have switch, therefore can avoid operation mistake.Naturally, also these switches can be provided.But these switches can only be used for could starting after talking with control device, and wherein user must confirm changed power at least one times.In addition, can specified power change can only occur in the application of special time period (such as 30 seconds).After this time period is expired, changed power needs to reaffirm.Preferably, this function can be monitored by the processor that is integrated in such as control device.
But, particularly preferably, if Design of Safety Device becomes processor, then according to the software control of security function by running within a processor of the safety device of equipment of the present invention.
According to another concept of the present invention, described CPU design becomes and probe communication.Then this probe such as notification processor its be designed to be applicable to which application, this processor impels control device to allow described transformator only generate the necessary power of described probe like this.Like this, in this, described processor can also be designed for the power parameter determining described control device and/or described transformator.
Be proved to be advantageously, this CPU design becomes to be used for forward (forward), forwards especially for the encryption to the power parameter of described control device of described control device and/or described transformator.Like this, described processor can forward described power parameter to described control device.And described power parameter is by the direct communications reception with described probe, and it is encrypted form.
According to independently concept of the present invention, described safety device is connected to sensor for communication order ground.Wherein, the ambient parameter of the treatment surface of described probe determined by described sensor, and the gas composition (composition of theatmosphere) in the environment of the described treatment surface of described probe determined especially by wherein said sensor.Actually by reference gas composition, can identify that this process occurs in the oral cavity of patient or on skin.
Like this, the present invention, without the need to implementing structure change or uncontrolled adjustment on equipment according to the present invention, just can realize the automatic adjustment of the necessary power bracket being suitable for the inside and outside instruction provided of human body.Be applicable to different application and power bracket according to single transducer of the present invention or plasma generator capable, its difference is the design of control device.Control device can not injure patient without the need to the instruction that third party's action just can process according to success regulates power demand automatically.
About whether can by human body or external gas be used for the composition change that the harmless and huge difference of successfully instruction simultaneously may be used for the gas at dry or moist device, shown in Figure 7.Fig. 7 shows the pure air composition of the drying at ground level.
Illustrate in form that the change due to air-breathing and only gas composition in the oral cavity of exhaling is compared.
In a further preferred embodiment, this device can be known there is measuring device for analyzing air, such as, measure the measuring device of oxygen content and/or carbon dioxide content.Therefore this measurement by specifically applying instruction, and can arrange output pulses (pulse)
Being produced by probe owing to being applied to pending necessary low pressure plasma of organizing, therefore described probe is preferably configured to glass probe.Wherein, actual process is performed by above-mentioned probe.Be applied in biological tissue, or when applying in biological tissues, so simple convenient operation of glass probe structure, and harmless in a physiologically.
In this case, verified relative to atmospheric pressure, under negative pressure or parital vacuum, fill conduction gas to described glass probe is worth.Wherein, preferably under the atmospheric pressure of 500Pa to 3000Pa, described glass probe is filled.Described conduction gas is preferably noble gas or noble gas mixtures.By such conduction gas, especially noble gas or noble gas mixtures, is preferably argon and/or neon, described low pressure plasma highly efficient in productivity, and makes whole device efficiency according to the present invention very high thus.Described glass probe at one end sealed by metal contact element; Wherein, the described high-frequency high-voltage provided by described transformator conducts to the inside of described glass probe by this metal contact element.In described glass probe, described gas is exposed in electromagnetic field of high frequency, and produces glow discharge thus.In this case, the output of described transformator can be adjusted by control device, makes described voltage can be arranged in the scope of 1800V to 35000V thus; Wherein said voltage transfers to the treatment surface of described glass probe by the conduction gas in described glass probe.If the treatment surface of described glass probe is arranged at directly over pending biological tissue, then described voltage is arranged between described treatment surface and described pending biological tissue, and the sheet resistance of the selectable sheet resistance according to described pending biological tissue of described voltage and described gas (especially air) is arranged.Wherein, described gas is between the treatment surface and the surface of pending biological tissue of described glass probe.
In order to make described probe can use the high-frequency high-voltage provided by described transformator efficiently, indispensable reliable electrical connection well between described transformator and described probe.According to independently thought of the present invention, above-mentioned electrical connection is well realized by being connected with described transformator electrical/electronic by contact spring by described probe.In this case, described contact spring can be arranged on described transformator or be arranged in described transformer room.On the other hand, described contact spring also can be arranged on described probe.In these examples, even if there is undesired gap between described probe and the connection of described transformator, described contact spring also ensure that the electrical contact between described probe and described transformator.
Method according to employing low pressure plasma process biological tissue of the present invention has foregoing equipment, and mainly comprises following methods step:
A) current intensity from 0.1 μ A to 300 μ A is provided in secondary coil side to power supply; Wherein, the form of this power supply is the DC voltage of scope from 12V to 600V or low-frequency ac voltage;
B) convert DC voltage or low-frequency ac voltage to high-frequency ac voltage, frequency is between 10kHz to 50kHz;
C) high-frequency ac voltage is converted to the voltage that scope is 1800V to 35000V;
D) be that the high-frequency ac voltage of 1800V to 35000V transfers to probe (2) by voltage range; Described probe is preferably glass probe; Wherein said probe above pending biological tissue, and and is provided with the spacing of 1mm to 5cm between described pending biological tissue.
In this connection, point out here, in the application of dental field, such as, when the process of intraoral gingiva, secondary coil side current intensity is chosen as between 0.1 μ A to 100 μ A.And in the application of other tissue surfaces, especially in the dermatosis process of the residue skin of pending patient, or in gynecological's application, secondary coil side current intensity is chosen as between 0.1 μ A to 300 μ A.
Accompanying drawing explanation
Other objects of the present invention, advantage, feature and possible application can be apparent by reference to the accompanying drawings from the description of following examples.In this case, independent of in claim and relevant combination, to describe and/or the characteristic single or combination in any of the institute of explaination constitutes theme of the present invention.
In accompanying drawing:
Fig. 1 shows according to the transformator of the equipment in one embodiment of the invention in transformer room;
Fig. 2 shows the transformer room according to the equipment in one embodiment of the invention;
Fig. 3 shows the circuit diagram according to the equipment in one embodiment of the invention;
Fig. 4 shows another circuit diagram according to the equipment in one embodiment of the invention;
Fig. 5 shows the typical pulse pattern of high frequency voltage pulse; Wherein, time dependent electric current density in units of μ A is shown;
Fig. 6 shows the schematic diagram of dielectric barrier discharge; And
Fig. 7 shows the pure air composition of the drying at ground level.
Detailed description of the invention
Illustrating the different elements of the equipment adopting low pressure plasma process biological tissue according to an embodiment of the invention, these elements will be explained in more detail subsequently.
Fig. 1 such as shows an embodiment of the transformer room 8 according to equipment of the present invention.Transformator is provided with in this transformer room 8.This transformator is made up of primary coil 4 and secondary coil 5.Control device 3 is connected with this transformator by male part 9.Wherein, this control device 3 so that with for providing power supply 13 (not shown) of mains power to be connected to transformator 1.Probe 2, especially glass probe are arranged on male part 7.And this male part 7 and then be arranged on one end relative with male part 9 in transformer room 8.In this case, contact spring 12 ensure that always there is electrical contact between transformator 1 and probe 2.In this example, transformer room 8 is configured to handle shape, and in the longitudinal extent of this transformator 8, the direction identical with secondary coil 5 with primary coil 4 extends.
In the present embodiment, secondary coil 5 winding is around excellent core 10; Then winding is around secondary coil 5 for primary coil 4, and this primary coil 4 and secondary coil 5 are provided with spacing; Wherein, this excellent core 10 is preferably made up of ferrite (ferrite).Above-mentioned spacing increases continuously towards one end up to d2 of the spacing of male part 7 from coil 4 and 5 towards one end with spacing d1 of male part 9 on this coil 4 and 5, with make primary coil on the secondary winding tapered coaxially to arrange.In the present embodiment, coil 4 and 5 has identical length L, thus coil 4 and 5 defines overlapping region B in its entire length.In this case, primary coil 4 also has the function of electromagnetic shielding, or guarantees shield effectiveness.Electromagnetic interference field can be made can not seriously to destroy the electromagnetic field of high frequency produced by transformator 1 by this primary coil 4.Therefore, gratifying function will be provided according to equipment of the present invention.In addition, also containment member is provided with in the end of commutator.
In the present embodiment, transformator 1 is configured to high-tension transformer, and this transformator 1 be designed so that inner secondary coil 5 in chamber 11 winding around excellent core 10; Wherein, this excellent core 10 is made up of ferrite.In embodiment shown here, in each chamber 11, this secondary coil 5 has 500 circles.But secondary coil also can have the number of turn of other quantity.
On the one hand, the task of the high frequency low voltage being provided by power supply 13 and control unit 3 being converted to high-frequency high-voltage born by transformator 1.But on the other hand, this transformator 1 is also born and is guided in the treatment surface of probe by produced high voltage particularly by the glass tubing (not shown) of probe 2; Wherein, probe 2 is configured to glass probe; Treatment surface is then positioned on one end relative with male part 7 on probe.
The setting of coil 4 and 5 in transformator 1 causes pulse to have presetting signal form, and this pulse is preferably sine pulse, and is particularly preferably with the sine pulse of exponential form decay, such as, shown in Fig. 5.Cold plasma or low pressure plasma can be produced between the treatment surface of probe 2 and pending tissue by this pulse.
Fig. 2 shows the structure of the transformer room 8 of Fig. 1, and this transformer room 8 is made up of electrically insulating material, and is preferably made of plastics.
Have one end of the male part 7 for probe 2 in transformer room 8, this transformer room is equipped with contact spring 12, this contact spring 12 and transformator 1 electrical contact.As introduction concise and to the point above, contact spring 12 provides the contact with probe 2.Potential pulse passes to probe 2 by this contact.The probe 2 being configured to glass probe is equipped with two chambers usually.100% neon is preferably filled under the negative pressure of 500Pa to maximum 3000Pa by inner cavity chamber.High voltage transfers on the tip of instrument probe by this inner cavity chamber.And outer chamber is used for insulating to inner cavity chamber and protecting.Inner cavity chamber is preferably made up of glass, and outer chamber can be made up of glass material or precious metal.
By crown cap mouth (metal flap) sealing on one end that the treatment surface of probe 2 is relative; Wherein, this crown cap mouth produces the formula that the is electrically interposed in connected system be connected with the transformator 1 being positioned at transformer room 8 together with contact spring 12 and male part 7.
Between the contact surface and pending biological tissue G of probe 2, provided High AC voltage and typical pulse pattern is made to cause the formation of cold plasma or low pressure plasma by the spacing between 1mm to 5mm.Wherein, by this cold plasma or low pressure plasma, the antibacterial on adhering tissue G, pathogenic bacteria, virus, fungus or other similar microorganisms can be killed.
Gas in the probe 2 being configured to glass probe is exposed to produced high-frequency alternating electromagnetic field, to produce glow discharge (micro discharge).In this case, the output of transformator can be adjusted by control device 3, thus can arrange the voltage of scope between 1.8V to 35V; This voltage transfers to the treatment surface of probe 2 subsequently by conduction gas.If the treatment surface of probe 2 is arranged at and pending organizes directly over G, then the voltage on this pending surface is arranged according to the sheet resistance (skin resistance) of the air between instrument probe tip and skin surface.
Method for the direct generation of low pressure plasma or cold plasma is corresponding with the structure of the dielectric barrier discharge shown in Fig. 6.Wherein, driving voltage produces in transformator 1.In this example, this probe 2 constitutes metal electrode 14 and electrolyte 15.Ground electrode formed by the pending G that organizes, between the metal electrode 14 making the driving voltage 16 provided by transformator 1 substantially be applied to thus to organize G and probe 2.Shown chart is used as the model of other assessments (assessment).
The physical assessment of plasma is formed by dielectric barrier discharge (dielectric barrier discharge).Wherein, dielectric barrier discharge is also referred to as dielectrically impeded discharges or voltolising; This dielectric barrier discharge makes at igniting build-up of luminance stage (ignition phase), and produces Athermal plasma silk P at atmosheric pressure.In this assessment, dielectrically impeded discharges or voltolising and corona discharge (alongside) are all the distortion of gas discharge.Wherein, this gas discharge at igniting build-up of luminance stage (ignition phase), and will produce Athermal plasma filament P at atmosheric pressure.Difference between two kinds of forms of gas discharge is that the extinguishing mechanism of discharge wire is different.Be that space charge is towards (charge-oriented) in the example of corona discharge; And be surface charge in the example of dielectric barrier discharge towards.
Basic structure shown in Fig. 6 is made up of two electrodes; Wherein these two electrodes are high-field electrode 14 and ground electrode G; And there is one or more dielectric barrier 15 (insulator) between two electrodes.Between medium 15 and ground electrode G, be provided with gap, the variable-width in this gap, the size of width is approximately in the scope of a few mm to cm.Pending sample is arranged on ground electrode G, or forms ground electrode G.In order to produce electric discharge, voltage is needed to be the alternating voltage of 1-100kV and the frequency of 10-50kHz.This electric discharge is characterized by the formation of micro discharge or plasma filament P.In the reaction, charge carrier gathers on electrolyte 15, and external electrical field is weakened, and causes the extinguishing of plasma filament P thus.Electrolyte 15 for current limit, and makes electric discharge can occur on multiple equally distributed point statistically, and makes pending organizing on the whole surface of G to carry out plasma treatment thus.
Fig. 3 and Fig. 4 shows two circuit in an illustrative manner, illustrated therein is safety device 30.Although become contact bridge (contact bridge) according to the Design of Safety Device of Fig. 3, the structure shown in Fig. 4 is more complicated.This contact bridge only can perform the power setting of control device 3 or transformator 1 according to the position of the switch of (with reference to) this contact bridge.
In the diagram, safety device 30 is implemented by processor 40.This processor 40 performs the power setting of control device 3 or transformator 1 under the help of installing probe in the device in accordance with the invention based on software control.In this example embodiment, probe 2 communicate with processor 40 and applied or operating parameter to processor 40.According to these information, the power parameter being suitable for described control device 3 or transformator 1 determined now by processor 40, and this power parameter sends control device 3 to.Like this, corresponding setting can be made, thus perform the process to tissue.
The physical assessment that plasma is formed carries out according to Paschen and Townsend method (Paschen and Townsendmethod).This analysis relates to the model of the dielectric barrier discharge shown in Fig. 6.This assessment makes it possible to the breakdown voltage (ignition voltage) determining to cause plasma to be formed.Below breakdown voltage, there is the plasma filament P being characterized by cold plasma or low pressure plasma.
Starting point (starting point) is electric capacity, and the distance between plates of this electric capacity is d=1mm.Air is provided with between the plate of electric capacity.α is the probability of electron ionization neutral atom or molecule in each unit length.Because the quality of the quick change of electric field and ion is comparatively large, the shock of ion and neutral atom therefore can be ignored.
If N is produced electron amount, then will apply following formula:
dN/dx＝αN (1.1)
In this case, N
0for outside produces the quantity of electronics, such as, by electron amount that cosmic radiation produces.And quantity and pressure p that ionization is clashed into ionize the probability clashed into and be directly proportional.
In addition, the kinetic energy for electronics will adopt following formula:
E
ion＝eE λ
ion(1.3)|
In this example, λ
ionfor acceleration path; E is applied electric field intensity.Due to the effect of non-resilient shock, make only have sub-fraction
flow through path λ
ionand there is no energy loss.
This makes constant α to be:
By breakdown voltage U
z ü nd=E
d, following formula can be obtained:
In this example, the quantity (the 3rd townsend coefficient) of the electronics that γ produces for each ion, wherein, makes ignition condition be by this quantity:
In this example, y<<1 substantially.
Illustrated therein is the Paschen's law curve of air (curve 1) and SF6 (curve 2).
P: pressure
S: gap size.
Paschen's law curve (Paschen curve) describes the product of gap size and pressure to the impact of the breakdown voltage for generation of gas discharge.
For the present embodiment, the impact of gap width on breakdown voltage can be estimated.
| Gap width | U zünd |
| 1mm | 3kV |
| 2mm | 6kV |
| 3mm | 9kV |
| 4mm | 12kV |
| 5mm | 15kV |
| 6mm | 18kV |
Therefore, there is electrical breakdown when voltage is 3kV and air is 1bar.Because all atoms or molecule ionize on whole path d, therefore above-mentioned voltage is for the necessary upper voltage limit of stable plasma.Below this voltage, in barrier discharge, thin discharge channel (plasma filament P) in-between the electrodes (on region interval 1mm) is formed; Wherein, this thin discharge channel is characterized by cold plasma.Under atmospheric pressure, a large amount of spark passage (micro discharge) distributed statistically can be observed.
Compared with the measurement of system, the necessary standard that exists of plasma is: Debye length (Debyelength) is less.The feature of this shielding length is, over which length, the probability of local ion or electron discharge fully and tempestuously declines (dropping to 1/e substantially).Therefore, because cation surrounded by spherical electron cloud in the plasma, electric charge is compensated to a certain extent each other.Wherein, these spherical radiuses are Debye length.In this example, because the quality of ion is larger, ion motion relative to electronics in alternating electric field can therefore be ignored.This motion can be ignored equally for Debye length.
For non-isothermal plasma, because its quality is less, the temperature of electronics is higher than the temperature of ion.In the example of barrier discharge,
T
e~ 1-10eV (2.2) (electron temperature) and
N
e~ 10
20-10
21m
-3(2.3) (the volume amount density of electronics)
If these numerical value are inserted in formula (2.1), then the Debye length of the non-isothermal plasma of barrier discharge is:
λ
d＝2.35·10
-6m (2.4)，
Wherein, the calculating of Debye length is used in number density being n
e=1020m
-3and electron temperature is the worst example of Te=10eV=1.16105K.
In this example, assuming that the order of magnitude of native system is the scope of mm, then Debye length is reduced to 1/1000, and the desirable criterion that plasma exists can meet thus.
Another standard is, the par of the charged particle in Debye sphere is greater than one.At n
e=1020m
-3unfavorable conditions under, about 5000 charged particles are positioned at Debye sphere, also can meet above-mentioned standard thus.
The physical premises condition for generation of cold plasma is met according to the parameter of equipment of the present invention.
list of reference numerals
1 transformator
2 probes
3 control device
4 primary coils
5 secondary coils
7 male parts (coupling)
8 transformer rooms
9 male parts
10 rod cores (rod core)
11 chambers
12 contact springs
13 power supplys
14 metal electrodes
15 electrolytes
16 driving voltages
30 safety devices
40 processors
P plasma filament (plasma filament)
B overlapping region
D1 spacing
D2 spacing
F points
K total capacitance
The electric capacity (capacitance finger) of CF finger
L length
SK resonant circuit
G organizes
Claims (12)
1. adopt an equipment for low pressure plasma process biological tissue (G), have
A) transformator (1), for the production of electromagnetic field of high frequency;
B) probe (2), with described transformator (1) electric coupling; And
C) control device (3), for controlling the electromagnetic field of high frequency produced by described transformator (1);
It is characterized in that, safety device (30) is connected with described control device (3), by described safety device (30), the power of the described electromagnetic field that can produce for transformator (1) described in corresponding application Lookup protocol.
2. equipment according to claim 1, it is characterized in that, described transformator (1) comprises transformer room (8), and described transformer room (8) have the male part (9) relative with the male part of described probe (7); Wherein said male part connects for the electrical/electronic of described control device (3); Described transformer room (8) is preferably configured to handle, and is formed with meeting ergonomic accordingly.
3. the equipment according to an aforementioned claim, is characterized in that, it is inner or outside that described control device (3) is arranged at described transformer room (8), and be connected with power supply.
4. the equipment according to Claims 2 or 3, it is characterized in that, it is inner that described safety device (30) is arranged to be positioned at electric mortiser head dummy connected system, described plug connected system is connected with described male part (7,9), and described male part (7,9) is positioned at described probe (2) or between described control device (3) and described transformator (1).
5. the equipment according to any one of foregoing Claims, is characterized in that, described safety device (30) is configured to resistor, memory chip or processor (40).
6. the equipment according to any one of foregoing Claims, is characterized in that, described memory chip or processor (40) are configured to communicate with described probe (2).
7. the equipment according to any one of foregoing Claims, is characterized in that, described memory chip or processor (40) are configured to the power parameter determining described control device and/or described transformator (1).
8. the equipment according to any one of foregoing Claims, it is characterized in that, described memory chip or processor (40) are designed for forwarding, and forward the power parameter of described control device (3) and/or described transformator (1) to described control device (3) especially for encryption.
9. the equipment according to any one of foregoing Claims, it is characterized in that, described safety device (30) is connected to sensor for communication order ground, the ambient parameter of the treatment surface of described probe (2) determined by wherein said sensor, and the gas composition in the environment of the described treatment surface of described probe (2) determined especially by wherein said sensor.
10. the equipment according to any one of foregoing Claims, is characterized in that, described probe (2) is configured to glass probe.
11. equipment according to claim 10, is characterized in that, described glass probe fills conduction gas under negative pressure, preferably fill under the negative pressure of 500Pa to 3000Pa, are particularly preferably and fill under 2000Pa; Described conduction gas is preferably noble gas or noble gas mixtures.
12. 1 kinds for the method by low pressure plasma process biological tissue (F), have the equipment according to any one of claim 1-11, have following methods step:
A) current intensity from 0.1 μ A to 300 μ A is provided in secondary coil (5) side to power supply; Wherein, the form of this power supply is the DC voltage of scope from 12V to 600V or low-frequency ac voltage;
B) convert DC voltage or low-frequency ac voltage to high-frequency ac voltage, frequency is between 10kHz to 50kHz;
C) high-frequency ac voltage is converted to the voltage that scope is 1800V to 35000V;
D) be that the high-frequency ac voltage of 1800V to 35000V transfers to probe (2) by voltage range; Described probe is preferably glass probe; Wherein said probe is positioned at above pending biological tissue, and and is provided with the spacing of 1mm to 5cm between described pending biological tissue.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012025079.7 | 2012-12-21 | ||
| DE102012025079.7A DE102012025079B4 (en) | 2012-08-31 | 2012-12-21 | Apparatus and method for treating biological tissue with a low pressure plasma |
| PCT/EP2013/003160 WO2014094931A1 (en) | 2012-12-21 | 2013-10-21 | Device and method for treating biological tissue with a low-pressure plasma |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104981270A true CN104981270A (en) | 2015-10-14 |
| CN104981270B CN104981270B (en) | 2018-01-05 |
Family
ID=49920305
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380067504.9A Expired - Fee Related CN104981270B (en) | 2012-12-21 | 2013-10-21 | Using the apparatus and method of low pressure plasma processing biological tissue |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2934673A1 (en) |
| JP (1) | JP2016500318A (en) |
| KR (1) | KR20150120938A (en) |
| CN (1) | CN104981270B (en) |
| DE (1) | DE102012025079B4 (en) |
| WO (1) | WO2014094931A1 (en) |
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| CN107550564A (en) * | 2017-10-31 | 2018-01-09 | 重庆京渝激光技术有限公司 | Treatment head for laser cure apparatus |
| CN110583101A (en) * | 2017-05-25 | 2019-12-17 | 欧瑞康美科（美国）公司 | plasma torch diagnostics using real-time voltage monitoring |
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| ITUB20155856A1 (en) * | 2015-11-04 | 2017-05-04 | Giuliano Natali | NEW HIGH-FREQUENCY PLASMA DETAIL COAGULATOR MODEL FOR MEDICAL USE |
| US10524849B2 (en) * | 2016-08-02 | 2020-01-07 | Covidien Lp | System and method for catheter-based plasma coagulation |
| DE102017116305A1 (en) * | 2017-07-19 | 2019-01-24 | Cinogy Gmbh | Plasma treatment device |
| KR101942362B1 (en) * | 2018-04-05 | 2019-01-25 | 주식회사 아단 | Plasma beauty device |
| DE102019122930A1 (en) * | 2019-08-27 | 2021-03-04 | Relyon Plasma Gmbh | Device for generating a gas discharge |
| US20230248963A1 (en) | 2020-07-24 | 2023-08-10 | Olaf Theisen | Device for supporting a treatment using pulsed electric fields in order to heal wounds and/or for the inactivation of microorganisms, and method for the inactivation of microorganisms |
| DE102020215103A1 (en) | 2020-12-01 | 2022-06-02 | BSH Hausgeräte GmbH | Method for controlling a plasma source of a hand-held device and hand-held device |
| DE102020215105A1 (en) | 2020-12-01 | 2022-06-02 | BSH Hausgeräte GmbH | Device for treating an object with plasma |
| DE102020215102A1 (en) | 2020-12-01 | 2022-06-02 | BSH Hausgeräte GmbH | Method of driving a plasma source of a device and device |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE102012025079B4 (en) | 2016-09-08 |
| DE102012025079A1 (en) | 2014-03-06 |
| CN104981270B (en) | 2018-01-05 |
| WO2014094931A1 (en) | 2014-06-26 |
| EP2934673A1 (en) | 2015-10-28 |
| JP2016500318A (en) | 2016-01-12 |
| KR20150120938A (en) | 2015-10-28 |
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